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  <script>
    function checkXMatrix(grid) {
      let l = grid.length
      for (let i = 0; i < l; i++)
        for (let j = 0; j < l; j++)
          if ((i === j || i + j === l - 1) === !grid[i][j]) return false
      return true
    };
    console.log(checkXMatrix([[5, 7, 0], [0, 3, 1], [0, 5, 0]]));
  </script>

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